added tracing cheat

tracing/TestFruits.java

@@ -0,0 +1,116 @@
+public class TestFruits  
+{  
+   public static void main(String[] args)  
+   {  
+      Apple a = new Apple(2);  
+      System.out.println(Apple.count);  
+      System.out.println();  
+      
+      Fruit[] fr = new Fruit[3];  
+      fr[0] = a;  
+      fr[1] = new RedDelicious();  
+      fr[2] = new Fruit(4);  
+      System.out.println();  
+      
+      System.out.println("Using array fr:  ");  
+      for(int  i  =  0;  i  <  fr.length;  i++)  
+      {  
+         fr[i].display();  
+         System.out.println(Apple.count);  
+         System.out.println();
+      }    
+   }
+}
+
+class Fruit  
+{              
+   public int f;  
+   
+   public Fruit(int f)  
+   {  
+      System.out.println("Fruit");  
+      this.f  =  f;  
+   }  
+   
+   public int getF()  
+   {  
+      return this.f;  
+   }  
+   
+   public void f1()  
+   {  
+      System.out.println("FRUIT f1");  
+   }  
+   
+   public void f2()  
+   {  
+      f1();  
+      System.out.println("FRUIT f2");  
+   }  
+   
+   public void display()  
+   {  
+      System.out.println("display method from Fruit invoked");  
+      f2();  
+   }  
+}
+
+class Apple extends Fruit  
+{              
+   public static int count = 0;  
+   
+   public Apple(int a)  
+   {  
+      super(a);  
+      System.out.println("Apple");  
+      count = count + getF();  
+   }  
+   
+   public void f1()  
+   {  
+      System.out.println("Apple f1");  
+   }  
+   
+   public void f2()  
+   {  
+      f1();  
+      System.out.println("Apple f2");  
+      super.f1();            
+   }  
+   
+   public void display()  
+   {  
+      System.out.println("display method from Apple invoked");  
+      f2();  
+   }      
+}  
+
+class RedDelicious extends Apple  
+{              
+   public static int count;  
+   
+   public RedDelicious()  
+   {  
+      super(3);  
+      System.out.println("RedDelicious");  
+      count = count + getF();  
+   }  
+   
+   public void f1()  
+   {  
+      System.out.println("RedDelicious f1");  
+   }  
+   
+   public void f2()  
+   {  
+      f1();  
+      System.out.println("RedDelicious f2");  
+      super.f1();          
+   }  
+   
+   public void display()  
+   {  
+      System.out.println("display method from RedDelicious invoked");  
+      f1();  
+   }  
+}  

tracing/out.txt

@@ -0,0 +1,25 @@
+Fruit
+Apple
+2
+
+Fruit
+Apple
+RedDelicious
+Fruit
+
+Using array fr:  
+display method from Apple invoked
+Apple f1
+Apple f2
+FRUIT f1
+5
+
+display method from RedDelicious invoked
+RedDelicious f1
+5
+
+display method from Fruit invoked
+FRUIT f1
+FRUIT f2
+5
+